Multicomponent nanostructures or hybrid nanocrystals were formed from different materials with distinctive properties. One particular material of such kind may combine photoluminescence, magnetic, or catalytic activity, in a single material.[1] Multifunctional nanocomposites based on magnetic metal and semiconductors would be useful in several predicted technological emerging fields, such as in nanomedicine, optoelectronics, magnetic bio-separation and detection, etc.[2,3] In the present report, we demonstrate the seeded growth strategy to grow semiconductor-magnetic metal hybrid nanostructures. Here we grew Co metal spheres preferentially on different faces of semiconductors nanorods (such as, CdS, CdSe, CdSe/CdS core/shell nanorods). The preferential growth of Co at the tip or on the side wall of the nanorods and their different structural and magnetic properties has been preliminarily investigated and will be discussed.

References:

1. Cozzoli, P.D.; Pellegrino, T; Manna, L Chem. Soc. Rev. 2006, (35), 1195-1208.

2. Quarta, A.; Corato, R. D.; Manna, L.; Ragusa, A.; Pellegrino, T. IEEE Trans. Nanobiosci. 2007, (4), 298-308.

3. Casavola, M.; Buonsanti, R.; Caputo, G.; Cozzoli, P. D. Eur. J. Inorg. Chem. In press.

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1. Chemical Assembly of Semiconductor Nanocrystals in Solution
2. Reversibly UV-light-induced hydrophobic/oleofilic to amphiphilic surface transition in thin films of organic-capped TiO₂ nanorods
3. Topologically controlled growth of colloidal semiconductor/magnetic nanocrystal heterostructures: site-selective functionalization of TiO₂ nanorods with either γ-Fe₂O₃ or ε-Co spherical domains